Hard to say anything about altcoins in general.
The amount of coins makes a large difference, and the rate at which they produce.
An altcoin like DogeCoin would never be worth $600 because there are way too many dogecoins and they get created too fast. But something like Ether could be worth more per coin because there aren't that many Ether I believe.
And bitcoin most likely will see $6000 pretty soon, probably at or before 2017
The pirce of the bitcoin will never get that amoun t becuase i know for sure that lots of people are not paying that much attention and dont want to see the price of th ebitcoin rise by that much
ytou need to use the bitcoin every day to see the price rising.